KR20050067605A - Aluminum alloy for galvanic anode - Google Patents
Aluminum alloy for galvanic anode Download PDFInfo
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- KR20050067605A KR20050067605A KR1020030098595A KR20030098595A KR20050067605A KR 20050067605 A KR20050067605 A KR 20050067605A KR 1020030098595 A KR1020030098595 A KR 1020030098595A KR 20030098595 A KR20030098595 A KR 20030098595A KR 20050067605 A KR20050067605 A KR 20050067605A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
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Abstract
본 발명은 유전양극용 알루미늄 합금에 관한 것이며, 더욱 상세하게는 사용환경에 따라 차이가 발생하는 저온 해수중의 구조물 방식에도 우수한 유전특성을 발휘하는 제조가 용이하고 독성이 없으며, 환경을 오염시키지 않는 낮은 전극전위와 우수한 전류효율을 가지는 유전양극용 알루미늄 합금에 관한 것이다.The present invention relates to an aluminum alloy for dielectric anodes, and more particularly, it is easy to manufacture and has no toxicity, and does not pollute the environment, even in a structure method in low temperature seawater where a difference occurs depending on the use environment. The present invention relates to an aluminum alloy for dielectric anodes having low electrode potential and excellent current efficiency.
종래의 유전양극용 알루미늄 합금은 알루미늄에 수은(Hg), 인듐(In), 카드뮴(Cd), 마그네슘(Mg), 주석(Sn), 아연(Zn) 등의 원소의 1종 또는 2종 이상을 첨가한 알루미늄 합금이 개발되었지만, 양극전위가 -1.0∼-1.1V이고 유전효율은 70∼85%에 불과하여 만족스럽지 못했다.Conventional aluminum alloys for dielectric anodes include one or two or more kinds of elements such as mercury (Hg), indium (In), cadmium (Cd), magnesium (Mg), tin (Sn), and zinc (Zn). The added aluminum alloy was developed, but it was unsatisfactory because the anode potential was -1.0 to -1.1V and the dielectric efficiency was only 70 to 85%.
특히, 독성이 강한 수은을 함유하는 알루미늄 합금은 환경오염의 원인이 되므로 수은을 안전하게 제거하는데 각별히 유의해야 되는 부담도 따랐다.In particular, aluminum alloys containing highly toxic mercury are a source of environmental pollution. Therefore, special care must be taken to safely remove mercury.
본 발명에 의한 유전양극용 알루미늄 합금은, 순도 99.8%의 알루미늄에 아연 0.5∼10.0%, 인듐 0.005∼0.05%, 갈륨 0.005∼0.5%, 규소 0.05∼0.5%를 첨가하여 조성한 것을 특징으로 한다.The aluminum alloy for dielectric anodes according to the present invention is characterized by adding 0.5 to 10.0% of zinc, 0.005 to 0.05% of indium, 0.005 to 0.5% of gallium, and 0.05 to 0.5% of silicon to aluminum having a purity of 99.8%.
Description
본 발명은 유전양극용 알루미늄 합금에 관한 것이며, 더욱 상세하게는 사용환경에 따라 차이가 발생하는 저온 해수중의 구조물 방식에도 우수한 유전특성을 발휘하는 제조가 용이하고 독성이 없으며, 환경을 오염시키지 않는 낮은 전극전위와 우수한 전류효율을 가지는 유전양극용 알루미늄 합금에 관한 것이다.The present invention relates to an aluminum alloy for dielectric anodes, and more particularly, it is easy to manufacture and has no toxicity, and does not pollute the environment, even in a structure method in low temperature seawater where a difference occurs depending on the use environment. The present invention relates to an aluminum alloy for dielectric anodes having low electrode potential and excellent current efficiency.
알루미늄은 낮은 표준전극전위(-1.66V)와 높은 이론 발생 전기량(2,980 Aㆍh/㎏)을 가지고 있지만, 표면이 산화피막으로 보호되기 때문에 해수 중에서의 양극전위는 약 -0.7V(포화감흥전극을 기준으로 하는 값)밖에 나타나지 않는다.Aluminum has a low standard electrode potential (-1.66 V) and a high theoretical generation amount (2,980 A · h / kg), but the anode potential in seawater is about -0.7 V (saturation induction electrode) because the surface is protected by an oxide film. Only values based on
이 점을 고려해 양극전위를 나타내는데 적합한 알루미늄 합금을 얻기 위하여 알루미늄에 수은(Hg), 인듐(In), 카드뮴(Cd), 마그네슘(Mg), 주석(Sn), 아연(Zn) 등의 원소의 1종 또는 2종 이상을 첨가한 알루미늄 합금이 개발되었지만, 양극전위가 -1.0∼-1.1V이고 유전효율은 70∼85%에 불과하여 만족스럽지 못했다.In consideration of this point, in order to obtain an aluminum alloy suitable for showing the anode potential, aluminum has one element of mercury (Hg), indium (In), cadmium (Cd), magnesium (Mg), tin (Sn), zinc (Zn), etc. Although aluminum alloys with added species or two or more kinds have been developed, the anode potential is -1.0 to -1.1V and the dielectric efficiency is only 70 to 85%, which is not satisfactory.
특히, 독성이 강한 수은을 함유하는 알루미늄 합금은 환경오염의 원인이 되므로 수은을 안전하게 제거하는데 각별히 유의해야 되는 부담도 따랐다.In particular, aluminum alloys containing highly toxic mercury are a source of environmental pollution. Therefore, special care must be taken to safely remove mercury.
한편, 특허공고 제1983-2513호의 유전양극용 알루미늄 합금은 상기한 종래의 알루미늄 합금이 안고 있던 문제를 해소하는데 기여한 점은 인정되지만 함유성분 중 마그네슘의 함량이 높아 제조원가의 부담이 되고, 유전특성도 미흡한 것이 단점으로 지적되고 있는 실정이다.On the other hand, the aluminum alloy for dielectric anodes of Patent Publication No. 1983-2513 is recognized to have contributed to solving the problems of the conventional aluminum alloy described above, but the magnesium content of the components is high, burdening manufacturing costs, and dielectric properties The lack is pointed out as a disadvantage.
본 발명의 목적은 고순도 알루미늄에 미량의 아연, 인듐, 갈륨 및 규소를 첨가하여 유전특성이 높고 무독성이며, 낮은 전극전위에서의 전류효율도 우수한데다 저온 해수중의 구조물 방식에 적용하는 경우에도 매우 우수한 유전특성을 발휘할 수 있는 유전양극용 알루미늄 합금을 제공하는 것이다. It is an object of the present invention to add a small amount of zinc, indium, gallium and silicon to high-purity aluminum, which has high dielectric properties, nontoxicity, excellent current efficiency at low electrode potential, and very good even when applied to structural methods in low temperature seawater. It is to provide an aluminum alloy for dielectric anodes that can exhibit dielectric properties.
본 발명은 순도 99.8%의 알루미늄에 아연 0.5∼10.0%, 인듐 0.005∼0.05%, 갈륨 0.005∼0.5%, 규소 0.05∼0.5%를 첨가한 알루미늄 합금을 특징으로 한다.The present invention features an aluminum alloy in which 0.5 to 10.0% of zinc, 0.005 to 0.05% of indium, 0.005 to 0.5% of gallium, and 0.05 to 0.5% of silicon are added to aluminum having a purity of 99.8%.
아연은 0.5∼10% 내에서 첨가하면 낮은 양극전위와 높은 전류효율이 얻어지지만 첨가량이 0.5%를 밑돌 경우에는 유전효율이 낮고 10%를 웃돌 경우에는 유전효율이 점차 떨어진다.When zinc is added within 0.5-10%, low anode potential and high current efficiency are obtained, but when the addition amount is less than 0.5%, the dielectric efficiency is low, and when it exceeds 10%, the dielectric efficiency gradually decreases.
또, 인듐은 양극전위를 저하시키는 반면에 전류효율은 상승시키는 성질이 있어 이를 활용하기 위한 것으로 첨가하는 것이며, 0.005% 미만을 첨가할 시에는 상기와 같은 바람직한 특성이 부여되지 않으므로 그 이상 함유하는 것이고, 첨가량이 0.05%를 웃돌 경우에는 양극의 용출표면에 자기부식이 증대하여 상온 및 저온 해수 중에서 사용할 때 전류효율이 현저히 저하된다.Indium has a property of lowering the anode potential while increasing the current efficiency, and is used for this purpose. When indium is added below 0.005%, the above-described desirable characteristics are not provided, so it is contained more than that. When the addition amount exceeds 0.05%, magnetic corrosion increases on the eluted surface of the anode, and the current efficiency is significantly lowered when used in room temperature and low temperature seawater.
게다가, 인듐은 고가여서 그 함량이 높으면 비경제적이다.In addition, indium is expensive and its content is uneconomical.
이 점을 고려할 때 인듐의 최대함량은 0.05%가 바람직하다.In consideration of this point, the maximum content of indium is preferably 0.05%.
갈륨은 0.005% 이상 첨가해야만이 낮은 양극전위가 기대되고, 0.5% 를 초과하면 전류효율의 저하, 용출면의 용해 얼룩 생성, 용해부에 끈적끈적한 점액 생성, 고가라는 문제에 봉착하게 된다.It is expected that gallium should be added at least 0.005% to have a low anode potential. If it exceeds 0.5%, gallium will suffer from problems such as deterioration of current efficiency, generation of dissolution stains on the eluted surface, sticky mucus formation at the dissolution zone, and high price.
규소는 유전효율을 개선하기 위해 첨가하는 것인데, 0.05% 이하에서는 유전효율의 개선효과가 미미하고, 0.5%를 초과하면 양극전위가 높아지는 결점이 있다.Silicon is added to improve the dielectric efficiency, but the effect of improving the dielectric efficiency is insignificant at 0.05% or less, and the anode potential is increased when it exceeds 0.5%.
이하에서 실시예를 든다.Examples are given below.
실시예Example
순도 99.8% 이상의 알루미늄을 흑연 도가니 중에 용해하고 710℃에서 모합금을 첨가하여 잘 교반한 용탕으로 알루미늄 합금을 주조하였다.Aluminum alloys having a purity of 99.8% or more were dissolved in a graphite crucible, and a mother alloy was cast at 710 ° C. to cast an aluminum alloy into a well stirred melt.
상기 알루미늄 합금과 기존의 알루미늄 합금으로 각각 27본의 양극 시료를 제작하고, 인공해수 중에서 양극 전류효율을 측정한 결과를 도 1에 표시하였다.27 positive electrode samples were prepared from the aluminum alloy and the existing aluminum alloy, respectively, and the results of measuring the anode current efficiency in artificial seawater are shown in FIG. 1.
도 1에서, 본 발명에 의한 알루미늄 합금(5-1∼5-9)은 구조물 방식에 적용했을 때 비교 합금인 기존의 알루미늄 합금(1-1∼4-9)보다도 유전양극 특성이 우수한 것을 확인할 수 있다.1, it is confirmed that the aluminum alloys (5-1 to 5-9) according to the present invention have superior dielectric anode characteristics than the conventional aluminum alloys (1-1 to 4-9) that are comparative alloys when applied to the structure method. Can be.
특히, 음극방식용 유전양극으로 사용하기 에 적합한 특성을 겸비한다.In particular, it has characteristics suitable for use as a dielectric anode for cathodic protection.
또, 합금의 양극전위는 -1.05∼-1.10V 하에서 안정값을 유지하고 용출상태는 초기에는 국부적인 용출이 나타나지만 시간이 지날수록 전면적으로 용해되었으며, 부식 생성물도 부착되지 않았다.In addition, the anode potential of the alloy was maintained at a stable value at -1.05 to -1.10V, and the eluted state showed local elution at first, but dissolved completely over time, and no corrosion products were attached.
본 발명에 의한 유전양극용 알루미늄 합금은 무독성으로서 저온 해수중의 구조물 방식에 적용했을 때 유전특성이 높고, 낮은 전극전위에서도 전류효율이 우수하다.The aluminum alloy for dielectric anode according to the present invention is non-toxic and has high dielectric properties when applied to the structure method in low temperature seawater, and excellent current efficiency even at low electrode potential.
특히, 음극방식용 유전양극으로 사용하기에 적합하면서도 합금 제조가 용이한 등의 효과를 가지는 매우 유용한 발명이다. In particular, it is a very useful invention having the effect of being suitable for use as an anode for a cathode method, but also easy to manufacture an alloy.
도 1은 본 발명에 의한 알루미늄 합금과 기존의 알루미늄 합금과의 양극전류효율 시험결과의 비교 도표1 is a comparison chart of the anodic current efficiency test results of the aluminum alloy and the conventional aluminum alloy according to the present invention
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Publication number | Priority date | Publication date | Assignee | Title |
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EP1918393A2 (en) * | 2006-11-03 | 2008-05-07 | Marina Protection Systems Pty Ltd. | Alloy for use in galvanic protection |
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Publication number | Priority date | Publication date | Assignee | Title |
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EP1918393A2 (en) * | 2006-11-03 | 2008-05-07 | Marina Protection Systems Pty Ltd. | Alloy for use in galvanic protection |
EP1918393A3 (en) * | 2006-11-03 | 2009-01-28 | Marina Protection Systems Pty Ltd. | Alloy for use in galvanic protection |
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